J/ApJS/93/161 CCD photometry of 6 globular clusters (Sarajedini+ 1994)
CCD photometry for six metal-rich galactic globular clusters.
Sarajedini A., Norris J.E.
<Astrophys. J. Suppl. Ser. 93, 161 (1994)>
=1994ApJS...93..161S 1994ApJS...93..161S (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Photometry, CCD
Keywords: globular clusters: general - stars: abundances - stars: evolution -
stars: Population II - techniques: photometric
Abstract:
We present CCD photometry for six metal-rich Galactic globular
clusters. The color-magnitude diagrams constructed from these data
reach well below the horizontal branch (HB), all of which are
predominantly redward of the instability strip. From these diagrams,
we have measured the magnitude of the HB, the color of the red giant
branch (RGB) at the level of the HB, and the magnitude difference
between the HB and the RGB clump. Using these quantities, we are able
to study the metallicities and reddenings of these clusters. We also
discuss the color distribution of stars on the horizontal branch for
these metal-rich systems and compare them with available data for
putative field disk red HB stars. There appears to be a dearth of
field red HB stars having [Fe/H]~-0.5 and B-V<0.85, which are
plentiful in the clusters studied here.
Objects:
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RA (2000) DE Designation(s)
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00 24 05.1 -72 04 51 47 Tuc = NGC 104
15 28 00.3 -50 40 22 NGC 5927
17 25 29.0 -48 25 22 NGC 6352
17 59 01.8 -44 15 55 NGC 6496
18 23 40.6 -30 21 39 NGC 6624
18 31 23.1 -32 20 53 NGC 6637 = M 69
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2 40 65 NGC 104 photometry
table3 40 371 NGC 5927 photometry
table4 46 231 NGC 6352 photometry
table5 40 252 NGC 6496 photometry
table6 40 374 NGC 6624 photometry
table7 46 408 NGC 6637 photometry
table8 54 6 Observed quantities
table9 92 5 Implications of using Zinn & West
(1984ApJS...55...45Z 1984ApJS...55...45Z) metallicities
table10 83 5 Simultaneously derived reddenings and metallicities
assuming Lee et al. (1990ApJ...350..155)
table11 83 5 Simultaneously derived reddenings and metallicities
assuming Castellani et al. (1991ApJS...76..911C 1991ApJS...76..911C)
table12 83 5 Simultaneously derived reddenings and metallicities
assuming Sandage (1993AJ....106..703S 1993AJ....106..703S)
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Byte-by-byte Description of file: table2 table3 table4 table5 table6 table7
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequentiql number in the cluster
5- 10 F6.2 pix Xpos X position
12- 17 F6.2 pix Ypos Y position
19- 23 F5.2 mag Vmag V magnitude
25- 29 F5.3 mag e_Vmag rms uncertainty on Vmag
31- 34 F4.2 mag B-V B-V colour index
36- 40 F5.3 mag e_B-V rms uncertainty on B-V
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Byte-by-byte Description of file: table8
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Bytes Format Units Label Explanations
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1- 8 A8 --- NGC Cluster name
10- 14 F5.2 mag V(HB) V magnitude of the horizontal branch (HB)
16- 19 F4.2 mag e_V(HB) rms uncertainty on V(HB)
21- 25 F5.2 mag V(HB)a V(HB) magnitude from
Armandroff (1989AJ.....96..588A 1989AJ.....96..588A)_
27- 31 F5.3 mag (B-V)g Red giant branch (B-V)g colour index
at the level of HB
33- 37 F5.3 mag e_(B-V)g rms uncertainty on (B-V)g
39- 42 F4.2 mag (B-V)gs ? (B-V)g colour index from Sandage
(1982ApJ...252..553S 1982ApJ...252..553S)
44- 47 F4.2 mag DeltaV ? DeltaV(HB)_bump = V(bump) - V(HB)
49- 53 F5.3 mag e_DeltaV ? rms uncertainty on DeltaV
54 A1 --- n_DeltaV [c] c: data from Fusi Pecci et al.
(1990A&A...238...95F 1990A&A...238...95F)
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Byte-by-byte Description of file: table9
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Bytes Format Units Label Explanations
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1- 8 A8 --- NGC Cluster name
10- 14 F5.2 Sun [Fe/H] Metallicity
16- 19 F4.2 Sun e_[Fe/H] rms uncertainty on [Fe/H]
21- 25 F5.3 mag (B-V)0g (B-V)0,g colour index
27- 31 F5.3 mag e_(B-V)0g rms uncertainty on (B-V)0g
33- 37 F5.3 mag E(B-V) Reddening
39- 43 F5.3 mag e_E(B-V) rms uncertainty on E(B-V)
45- 48 F4.2 mag E(B-V)z Zinn (1985ApJ...293..424Z 1985ApJ...293..424Z) reddening
50- 53 F4.2 mag DeltaV1 V(bump) - V(HB) from Lee et al.
(1990ApJ...350..155)
55- 59 F5.3 mag e_DeltaV1 rms uncertainty on DeltaV1
61- 64 F4.2 mag DeltaV2 V(bump) - V(HB) from Castellani et al.
(1991ApJS...76..911C 1991ApJS...76..911C)
66- 70 F5.3 mag e_DeltaV2 rms uncertainty on DeltaV2
72- 75 F4.2 mag DeltaV3 V(bump) - V(HB) from Sandage
(1993AJ....106..703S 1993AJ....106..703S)
77- 81 F5.3 mag e_DeltaV3 rms uncertainty on DeltaV3
83- 86 F4.2 mag DeltaVo ? Observed V(bump) - V(HB)
88- 92 F5.3 mag e_DeltaVo ? rms uncertainty on DeltaVo
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Byte-by-byte Description of file: table10 table11 table12
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Bytes Format Units Label Explanations
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1- 8 A8 --- NGC Cluster name
10- 15 F6.3 [Sun] [Fe/H] Metallicity
17- 21 F5.3 [Sun] e_[Fe/H] rms uncertainty on [Fe/H]
23- 27 F5.3 mag E(B-V) Reddening
29- 33 F5.3 mag e_E(B-V) rms uncertainty on E(B-V)
35- 39 F5.3 mag DeltaV1.4 V(HB) - V
41- 45 F5.3 mag e_DeltaV1.4 rms uncertainty on DeltaV1.4
47- 51 F5.2 [Sun] [Fe/H]zw Zinn & West (1984ApJS...55...45Z 1984ApJS...55...45Z) metallicity
53- 56 F4.2 [Sun] e_[Fe/H]zw rms uncertainty on [Fe/H]zw
58- 61 F4.2 mag E(B-V)z Zinn (1985ApJ...293..424Z 1985ApJ...293..424Z) reddening
63- 66 F4.2 mag DeltaVp Predicted V(bump) - V(HB)
68- 72 F5.3 mag e_DeltaVp rms uncertainty on DeltaVp
74- 77 F4.2 mag DeltaVo ? Observed V(bump) - V(HB)
79- 83 F5.3 mag e_DeltaVo ? rms uncertainty on DeltaVo
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Table 13. Mean horizontal branch colors
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Cluster F(B-V) <(B-V)0> Limits
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NGC 104 0.04 0.77 (0.70, 0.90)
NGC 5927 0.45 0.88 (0.76, 0.98)
NGC 6352 0.21 0.86 (0.76, 0.98)
NGC 6496 0.22 0.84 (0.70, 0.90)
NGC 6624 0.28 0.81 (0.70, 0.90)
NGC 6637 0.12 0.80 (0.70, 0.90)
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History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 05-Jun-1997